Method of producing hydrocarbon-expanded rigid polyurethane...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/14 (2006.01) C08G 18/10 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01) C08G 18/50 (2006.01)

Patent

CA 2248228

Described is a method of producing rigid polyurethane foams from polyols and polysiocyanates plus foaming agents and, optionally, foaming auxiliaries. The method is characterized in that the foam is obtained by reacting: A) a polyol component with an average of at least three hydrogen atoms and containing 1) 60 to 100 % of polyethers and/or polyesters with at least two hydroxyl groups, a molecular weight of 250 to 1,500 and an interfacial tension of 6 to 14 mN/m with respect to the iso-and/or n-pentane used as the foaming agent, 2) iso- and/or n-pentane as the foaming agent, 3) water and optionally 4) auxiliaries and additives with B) a polyisocyanate with an NCO content of 20 to 48 % by weight and with an interfacial tension of 4.0 to 8 mN/m with respect to the iso- and/or n-pentane used as the foaming agent.

L'invention concerne un procédé de production de mousses rigides de polyuréthanne à partir de polyols et de polyisocyanates, ainsi que d'agents d'expansion, et le cas échéant, d'auxiliaires de moussage. Ce procédé est caractérisé en ce que la mousse rigide de polyuréthanne est obtenue par réaction de (A) un composant polyol comportant en moyenne 3 atomes d'hydrogène, contenant: (1) 60 à 100 % de polyéthers et/ou de polyesters comportant au moins 2 groupes hydroxyle, présentant un poids moléculaire compris entre 250 et 1500, et une tension interfaciale de 6 à 14 mN/m par rapport à l'isopentane et/ou au n-pentane utilisé(s) comme agent d'expansion; (2) de l'isopentane et/ou du n-pentane servant d'agent d'expansion; (3) de l'eau; (4) et éventuellement des auxiliaires et additifs; avec (B) un polyisocyanate présentant une teneur en NCO comprise entre 20 et 48 % en poids et, par rapport à l'isopentane et/ou au n-pentane utilisé(s) comme agent d'expansion, une tension interfaciale de 4,0 à 8 mN/m.

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